Add delivery plan: slice the build into parallel specifications

[IanMayo]

What this adds

A new candidate canonical document, assay-delivery-plan.md, that reads the existing root-level documents (assay-scaffold.md, assay-build-plan.md, assay-ui-design.md) and answers the question: how do we deliver this, and where can work run in parallel?

It does not re-sequence the build plan or introduce methodology (that stays in the register, DEC-2). It translates the seven stages into spec-kit-shaped slices and makes the implicit dependency structure explicit.

Key content

• How we deliver (§1) — three facts that set the shape: four canonical documents are declared but unauthored and gate almost everything; the scorer is the delivery linchpin (DEC-10); the front end is a separable lane (DEC-5).
• The specification series (§2) — five document slices (D1–D5: register, knowledge-model, seam-contract, vignette, architecture) and sixteen build specifications (SPEC-01…16), each mapped to its build-plan stage, dependencies, and DEC-11 research note. Exit criteria become the spec-kit acceptance scenarios.
• Dependency graph & critical path (§3) — a Mermaid graph (pinned theme, per-subgraph styles, TB per scaffold §5); critical path D2 → D3 → SPEC-05 → SPEC-06 → SPEC-07 → SPEC-15 → SPEC-16, with float called out (generator SPEC-08 is sacrificial scope).
• Parallel-working plan (§4) — six swimlanes with barriers marked; where parallelism is genuine (front-end vs services, the five-wide depth fan-out behind the scorer, the three analysis slices) and where it is false and must not be attempted (generator ahead of scorer, code ahead of its research note, surfaces before the gate). A wave structure with per-wave exit gates.
• Open questions that gate slicing (§5) and next step (§6) — how to instantiate each slice via the installed Spec Kit toolchain.

Notes for review

• Placed at repo root to match the existing assay-*.md convention and the task framing ("root level documents"); it is marked a candidate addition to the canonical set, not yet ratified.
• No decisions are originated here — it cites DEC-4/5/7/10/11 and defers the four gating open questions to the register.

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